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Mike Whisky
Joined: 05 Jun 2006
Posts: 336
Location: Switzerland
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 Posted: Wed Dec 25, 2013 11:32 am Post subject: Rudder lock possible? |
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Hi,
I posted this at VAF as well but would like to get your opinion as well.
I did a couple days ago a stability test flight to check how the aircraft behaves when you apply full rudder in climb, cruise and descent with full flaps.
In climb at about 100 kt with wings level I applied slowly more and more right rudder until I hit the limit. that process took a couple of seconds about approximately an inch before the limit the rudder got soft and locked aerodynamically. I immediately gave opposite rudder to go straight again.
My question now is if other experienced this as well, would it come back and I just need to wait a bit? I guess one is expected to give full rudder more swiftly and check the behavior then. If you apply it slowly the aircraft is at so much slip that the bigger part of the rudder is covered by the VS near the end of its range and only the counter balance gets the airstream, just a guess though.
I replicated this about four times left and right in cruise and climb. Interesting enough that in landing config at 70kt it did not appear but it might be that I pressed the rudder more swiftly du to the speed loss when you yaw the aircraft.
Regards
Mike
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rv10flyer
Joined: 25 Aug 2009
Posts: 364
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| Posted: Wed Dec 25, 2013 8:21 pm Post subject: My RV-10 Full Flap Limit= 87 KIAS |
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| Mike Whisky wrote: | Hi,
I posted this at VAF as well but would like to get your opinion as well.
I did a couple days ago a stability test flight to check how the aircraft behaves when you apply full rudder in climb, cruise and descent with full flaps.
In climb at about 100 kt with wings level I applied slowly more and more right rudder until I hit the limit. that process took a couple of seconds about approximately an inch before the limit the rudder got soft and locked aerodynamically. I immediately gave opposite rudder to go straight again.
My question now is if other experienced this as well, would it come back and I just need to wait a bit? I guess one is expected to give full rudder more swiftly and check the behavior then. If you apply it slowly the aircraft is at so much slip that the bigger part of the rudder is covered by the VS near the end of its range and only the counter balance gets the airstream, just a guess though.
I replicated this about four times left and right in cruise and climb. Interesting enough that in landing config at 70kt it did not appear but it might be that I pressed the rudder more swiftly du to the speed loss when you yaw the aircraft.
Regards
Mike |
I did not test that flight regime. Imagine if one flap departed and how your little ailerons would counter the roll. It happened in a Cherokee one time. He rolled and ended up losing a wing too.
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johngoodman
Joined: 18 Sep 2006
Posts: 530
Location: GA
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| Posted: Thu Dec 26, 2013 7:11 am Post subject: Re: Rudder lock possible? |
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Geeez, Mike, that's like practicing to bleed....
John
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Mike Whisky
Joined: 05 Jun 2006
Posts: 336
Location: Switzerland
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| Posted: Thu Dec 26, 2013 9:37 am Post subject: Re: Rudder lock possible? |
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This is part of the test flight regime. I know one would not be in this situation in normal operations, however I still believe that the test flight program is exactly built to understand the aircraft behavior within the design envelope.
Mike
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dave.saylor.aircrafters(a
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| Posted: Thu Dec 26, 2013 10:14 am Post subject: Rudder lock possible? |
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I've seen this in my plane and a customer's -10. He described it to me first. He's a very careful and conscientious pilot. Also lots of acro and formation.
We did this straight-and-level at moderate IAS. It's a little surprising at first but so far it's been completely manageable. If you expect it, it's a non-event. Just opposite rudder and it unsticks. I haven't tried it in a climb.
Dave Saylor
831-750-0284 CL
On Wed, Dec 25, 2013 at 11:32 AM, Mike Whisky <rv-10(at)wellenzohn.net (rv-10(at)wellenzohn.net)> wrote:
[quote] --> RV10-List message posted by: "Mike Whisky" <rv-10(at)wellenzohn.net (rv-10(at)wellenzohn.net)>
Hi,
I posted this at VAF as well but would like to get your opinion as well.
I did a couple days ago a stability test flight to check how the aircraft behaves when you apply full rudder in climb, cruise and descent with full flaps.
In climb at about 100 kt with wings level I applied slowly more and more right rudder until I hit the limit. that process took a couple of seconds about approximately an inch before the limit the rudder got soft and locked aerodynamically. I immediately gave opposite rudder to go straight again.
My question now is if other experienced this as well, would it come back and I just need to wait a bit? I guess one is expected to give full rudder more swiftly and check the behavior then. If you apply it slowly the aircraft is at so much slip that the bigger part of the rudder is covered by the VS near the end of its range and only the counter balance gets the airstream, just a guess though.
I replicated this about four times left and right in cruise and climb. Interesting enough that in landing config at 70kt it did not appear but it might be that I pressed the rudder more swiftly du to the speed loss when you yaw the aircraft.
Regards
Mike
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RV-10 builder (flying, test phase)
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Mike Whisky
Joined: 05 Jun 2006
Posts: 336
Location: Switzerland
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| Posted: Fri Dec 27, 2013 10:51 am Post subject: Re: Rudder lock possible? |
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Thanks Dave,
I guess that most RV-10 would react that way if they are built to plans and the rudder will stop at the control stops. As said before it was easy to get her straight with opposite rudder. I will repeat the test with a faster full rudder deflection and see if this changes anything.
Regards
Mike
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